/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicBoneAttribute.h
Copy data from a different attribute to this one, using the mesh index mapping to determine the correspondence
true if the copy succeeded, false otherwise (e.g. false if the data from the source attribute was not compatible and the CopyOut failed to copy across)
virtual bool CopyThroughMapping ( const [TDynamicAttributeBase](API\Runtime\GeometryCore\DynamicMesh\TDynamicAttributeBase)< ParentType > * Source, const [FMeshIndexMappings](API\Runtime\GeometryCore\DynamicMesh\FMeshIndexMappings) & Mapping )